/*
 * Copyright (c) 2020-2021. the original authors and DEPSEA.ORG
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.depsea.butterfly.web.converter;

import com.google.common.collect.Lists;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.convert.converter.Converter;
import org.springframework.lang.NonNull;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.List;

/**
 * String to java {@code java.time.LocalDate}, supported pattern: [yyyy-MM-dd, yyyy/MM/dd]
 *
 * @author jaune
 * @since 1.0.0
 */
public class StringToLocalDateConverter  implements Converter<String, LocalDate> {

    private final List<DateTimeFormatter> formatters = Lists.newArrayList(
            DateTimeFormatter.ofPattern("yyyy-MM-dd"),
            DateTimeFormatter.ofPattern("yyyy/MM/dd")
    );


    public LocalDate convert(@NonNull String source) {
        if (StringUtils.isBlank(source))
            return null;
        for (DateTimeFormatter formatter : formatters) {
            try {
                return LocalDate.parse(source, formatter);
            } catch (DateTimeParseException ignored) {
            }
        }
        return null;
    }
}
